Thanks for the comments about the power supply and possible other audio related problem.? I am also consulting with HF Signals.? They asked me for some videos of what is going on.? They also suggested consulting the forum.? ?The V3 software
seems to be functional.? Is it possible the RPi 4 board is the culprit?
Don
W5MMJ
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On Wed, Jul 24, 2024 at 03:23 PM, Don Judd wrote:
My recently purchased sBitx V3 is not receiving signals on any band....just hearing the noise floor.? On 20 and 17 m., I am hearing something like a heterodyne across those bands.? HF Signals sent me another V3 image file to burn to a micro SD card
but did not solve the problem.? Any suggestions from there?
What power supply are you using Don?
In my use, I have v2, which I supply with 12.5V and have a current limit of 6.3A. Yours is v3, then you can use a higher voltage up to 13.8V. If I had it, I would also use it with current limitation.
A possible error in the audio final amplifier is that the IC power supply of the final stage is fed through a 2R2 resistor. It's worth checking, it might be broken or soldered wrong. Before you watch this, you can also try it with headphones, in which case
the audio output stage is not in use.
These are just tips, you have to find and fix the error if you don't want to send it back to the manufacturer.
--
Gyula HA3HZ
